Detections
Analytics

Security Updates for Microsoft Outlook Products (September 2026)

high Nessus Plugin ID 344287

Synopsis

The Microsoft Outlook Products are affected by multiple vulnerabilities.

Description

The Microsoft Outlook Products are missing a security update. They are, therefore, affected by multiple vulnerabilities:

 - Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-69629)

 - Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network. (CVE-2026-78519)

 - Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose information over a network. (CVE-2026-80073)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Microsoft has released KB5002919 to address this issue.

See Also

https://support.microsoft.com/en-us/help/5002919

Plugin Details

Severity: High

ID: 344287

File Name: smb_nt_ms26_sep_outlook.nasl

Version: 1.2

Type: Local

Agent: windows

Published: 9/9/2026

Updated: 9/10/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.6

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-78519

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:microsoft:outlook

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/8/2026

Reference Information

CVE: CVE-2026-69629, CVE-2026-78519, CVE-2026-80073

MSFT: MS26-5002919

MSKB: 5002919